A vane is a flat or curved piece of metal or material that moves and shows the direction of the wind. It is often seen on top of buildings, weather vanes, or wind turbines. Full definition
I'm a writer, teacher, performer, photographer, traveler, eater of many things and wearer of many hats (not just tinfoil hats with weather vanes on top). (firstsiteguide.com)
The two variations on the 250 theme are distinguishable by the number of vanes in the front - fender air vents; first - series Spiders have three, second - edition models sport two. (automobilemag.com)
«Another lure was the whale weather vane on the roof. (styleathome.com)